方法采用多阶段随机分层抽样方法，对1261名40岁以上居民进行问卷调查。
Methods Cluster, stratified and multistage sampling was taken. 1261 residents over 40 years old were assigned to fill in the questionnaires designed by WHO.
在简单随机抽样方法的基础上提出了分层抽样的模糊综合评价模型。
A layered sampling model for fuzzy comprehensive evaluation was developed based on simple random sampling methods.
具体介绍了砼强度检测抽样的几种方法：现行规程抽样法；简单随机抽样法；分层抽样法。
This paper introduced several methods about the concrete strength inspection: the sampling method given by the present specification; simple random sampling without replacement; stratified sampling.
设计：分层抽样，随机分组对照，量效分析。
DESIGN: Grade sampling, randomized controlled quantitative analysis.
分层抽样可以减少由简单随机抽样造成的抽样误差。
Stratified sampling can reduce the sampling error associated with simple random samples.
定义和应用确保数据准确和完整的技巧，如随机抽样法、分层抽样法、样本同质性等。
Define and apply techniques for assuring data accuracy and integrity such as random sampling, stratified sampling, sample homogeneity, etc.
但到目前为止，地质数据的抽样检查基本上采用百分比抽样方案及简单随机和分层抽样方法。
However, percent sampling has been mainly used for sampling inspection of geological data till now.
方法 采用分层抽样和随机抽样方法对15家 医疗机构和2 937名疟区居民进行流行病学调查。
Method 15 hospitals and 2 937 residents were selected and studied through random and systematic sampling methods in Hainan Province.
方法 采用分层抽样和随机抽样方法对15家 医疗机构和2 937名疟区居民进行流行病学调查。
Method 15 hospitals and 2 937 residents were selected and studied through random and systematic sampling methods in Hainan Province.
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